1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
#include <linux/kernel.h>
#include <unistd.h>
#include <sys/types.h>
#include "session.h"
#include "sort.h"
#include "util.h"
static int perf_session__open(struct perf_session *self, bool force)
{
struct stat input_stat;
self->fd = open(self->filename, O_RDONLY);
if (self->fd < 0) {
pr_err("failed to open file: %s", self->filename);
if (!strcmp(self->filename, "perf.data"))
pr_err(" (try 'perf record' first)");
pr_err("\n");
return -errno;
}
if (fstat(self->fd, &input_stat) < 0)
goto out_close;
if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
pr_err("file %s not owned by current user or root\n",
self->filename);
goto out_close;
}
if (!input_stat.st_size) {
pr_info("zero-sized file (%s), nothing to do!\n",
self->filename);
goto out_close;
}
if (perf_header__read(&self->header, self->fd) < 0) {
pr_err("incompatible file format");
goto out_close;
}
self->size = input_stat.st_size;
return 0;
out_close:
close(self->fd);
self->fd = -1;
return -1;
}
struct perf_session *perf_session__new(const char *filename, int mode,
bool force, struct symbol_conf *conf)
{
size_t len = filename ? strlen(filename) + 1 : 0;
struct perf_session *self = zalloc(sizeof(*self) + len);
if (self == NULL)
goto out;
if (perf_header__init(&self->header) < 0)
goto out_free;
memcpy(self->filename, filename, len);
self->threads = RB_ROOT;
self->last_match = NULL;
self->mmap_window = 32;
self->cwd = NULL;
self->cwdlen = 0;
map_groups__init(&self->kmaps);
if (perf_session__create_kernel_maps(self, conf) < 0)
goto out_delete;
if (mode == O_RDONLY && perf_session__open(self, force) < 0)
goto out_delete;
out:
return self;
out_free:
free(self);
return NULL;
out_delete:
perf_session__delete(self);
return NULL;
}
void perf_session__delete(struct perf_session *self)
{
perf_header__exit(&self->header);
close(self->fd);
free(self->cwd);
free(self);
}
static bool symbol__match_parent_regex(struct symbol *sym)
{
if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
return 1;
return 0;
}
struct symbol **perf_session__resolve_callchain(struct perf_session *self,
struct thread *thread,
struct ip_callchain *chain,
struct symbol **parent)
{
u8 cpumode = PERF_RECORD_MISC_USER;
struct symbol **syms = NULL;
unsigned int i;
if (self->use_callchain) {
syms = calloc(chain->nr, sizeof(*syms));
if (!syms) {
fprintf(stderr, "Can't allocate memory for symbols\n");
exit(-1);
}
}
for (i = 0; i < chain->nr; i++) {
u64 ip = chain->ips[i];
struct addr_location al;
if (ip >= PERF_CONTEXT_MAX) {
switch (ip) {
case PERF_CONTEXT_HV:
cpumode = PERF_RECORD_MISC_HYPERVISOR; break;
case PERF_CONTEXT_KERNEL:
cpumode = PERF_RECORD_MISC_KERNEL; break;
case PERF_CONTEXT_USER:
cpumode = PERF_RECORD_MISC_USER; break;
default:
break;
}
continue;
}
thread__find_addr_location(thread, self, cpumode,
MAP__FUNCTION, ip, &al, NULL);
if (al.sym != NULL) {
if (sort__has_parent && !*parent &&
symbol__match_parent_regex(al.sym))
*parent = al.sym;
if (!self->use_callchain)
break;
syms[i] = al.sym;
}
}
return syms;
}
|
